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79 Multiple choice questions

  1. Conventional current =
  2. is the ratio of the charge to the potential difference of the plates
  3. Unit for potential difference is the
  4. Req=(1/Ra +1/Rb...)^-1
  5. variable for resistance
  6. The plates become charged by connecting them to a source of
  7. unit for EMF
  8. EMF
  9. A charged capacitor stores
  10. is the displacement from reference point
  11. control the amount of current in a conductor
  12. -sum up I
  13. is the change in electric potential
  14. Higher temperature =
  15. -Req> any R of a device
  16. Ohm's law only applies to materials that have constant resistance - called
  17. ∆V = ∆PEelectric/q
  18. V = IR
  19. point charges are not____ because their field weakens at a distance
  20. variable for current
  21. Greater area =
  22. a unit of energy, energy 1 electron gains when moved through a potential difference of 1V.
  23. lower the body's resistance
  24. Negative charges inside the battery move from the ___ terminal to the ____
  25. net velocity of the charge carriers, very small (~25mm/s)
  26. device used to store electric potential energy
  27. is the rate of charge transfer
  28. no change in PE, no
  29. Power companies measure energy usage in
  30. variable for potential difference
  31. Potential energy associated with the interaction of charges
  32. -one path
  33. variable for joule
  34. Changing the____ between the plates of a capacitor will change how much charge it can hold
  35. variable for volt
  36. Movement of electric charge
  37. terminals causing potential difference are constantly changing sign, causes charges to just vibrate back and forth rather than flow
  38. Potential difference maintains ____ in a circuit
  39. Whenever a charge is moved by another charge's electric field force,____ is done
  40. Current motion is actually made up of positive, negative or movement of both - called
  41. discovered that animals conduct electricity - frog legs twitched when conducting electrical experiments near the frog
  42. Longer material =
  43. variable for ampere
  44. When the plates are charged, the capacitor is said to be
  45. unit for capacitance
  46. no PE for
  47. Mechanical energy is conserved as long as there is
  48. Capacitors made with a _____ between the plates hold more charge - this book assumes vacuum between plates
  49. SI unit for electrical energy is
  50. in the conductor move along a zig-zag due to their vibrations - causes collisions and energy transfer
  51. When a charge is moved in a uniform electric field, the change in location relates to a change in
  52. is the potential energy associated with a charge in an electric field
  53. rate of energy conversion
  54. -Req= Ra+Rb+Rc....
  55. Resistance is____ over a range of potential differences
  56. unit for resistance
  57. a type of resistor that allows the user to change the potential difference across a conductor - used on volume control knobs, dimmer light switch, video game controllers
  58. electrons move in one direction, from low electric potential to high electric potential (remember conventional current is flow of positive charge) - conventional current moves from positive terminal to negative terminal
  59. The negative sign means that the PE will ____ when the charge is negative and ______ when the charge is positive
  60. Once a capacitor is charged it will remain so until
  61. -2 or more paths
  62. energy storage unit that maintains a constant potential difference between two locations called terminals
  63. No work is done when a charge is moved _____ to an electric field, and the PEelectric remains constant
  64. Work done to move the charge is a measure of the
  65. -constant I
  66. Electrons move ____ through a conductor in the opposite direction from the electric field - however E reaches the electrons at nearly c
  67. Free electrons in a conductor move from areas of ___ electric potential to areas of ___ electric potential
  68. variable for electrical energy
  69. unit for electric power
  70. Opposition of the motion of charge through a conductor
  71. -Req< any components resistance
  72. is the permittivity in a vacuum, which is 8.85x10-12 C2/(Nm2)
  73. Electric potential energy is a form of
  74. variable for ohm
  75. When discharged, the charges move between the plates until the potential difference is
  76. -constant V
  77. -sum up V
  78. is the permittivity of the material,
  79. unit for current